Andreas Stihl Ag & Co.

Johann Trumpf

Michael Raffenberg

Klaus Langhans

The invention relates to a brushcutter which is driven by an internal combustion engine ( ) mounted in a housing ( ). The brushcutter has a work tool ( ) with a rotatable cutting tool ( ). The brushcutter includes a guide tube ( ) on which a cutterhead ( ) is attached to an end ( ) thereof and the engine housing ( ) is attached to the other end ( ). A drive shaft ( ) is guided in the guide tube ( ) and connects the engine ( ) to the cutting tool ( ). A guide handle ( ) is arranged on the guide tube ( ) at a spacing from the motor housing ( ). The motor housing ( ) includes a sleeve-shaped collar ( ) which has such a configuration that it engages over the end ( ) of the guide tube ( ) facing toward the engine. The collar ( ) is connected to the guide tube ( ) at the free end ( ) of the collar at a pregiven distance (a) to the end ( ) of the guide tube ( ) facing toward the engine.

Brushcutter

The invention is directed to a guide tube assembly for a portable handheld work apparatus with a drive motor ( ) mounted at one end ( ) of the guide tube ( ). The drive motor ( ) is connected to a work tool ( ) mounted at one end ( ) of the guide tube ( ) via a drive shaft ( ) mounted in the guide tube ( ). A reinforcing sleeve ( ) is axially inserted into the work tool end ( ) of the guide tube ( ) in order to better introduce engine loads at a flange ( ) of the work tool ( ) into the guide tube ( ). The reinforcing sleeve ( ) projects axially along a part length (L&prime;) of the guide tube ( ) from the flange ( ) into the guide tube ( ).

Guide tube assembly for a portable handheld work apparatus

A connector between a carburetor and a cylinder connection of an internal combustion engine of an implement is provided. The flow channel formed in the connector is provided with raised portions over the inner periphery of the channel. To avoid fluctuations in the speed of the engine as a function of changes in position of the implement, the raised portions are embodied as wall portions that are oriented approximately transverse to the center line of the channel. The wall portions provide a flow cross-section for the channel that varies in a step-shape or terrace-shaped manner.

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Winnenden, Germany

Johann Trumpf